Journal
TERRA NOVA
Volume 32, Issue 4, Pages 300-323Publisher
WILEY
DOI: 10.1111/ter.12462
Keywords
Cuonadong Dome; sheath folds; southern Tibet; STDS; zircon U-Pb age
Categories
Funding
- Ministry of Science and Technology Program [2018YFC0604103, 2016YFC060308]
- China Geological Survey Program [DD20190147]
- National Natural Science Foundation of China [91955208, 41602214]
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Structural analysis and new zircon U/Pb geochronology were performed in the Cuonadong Dome in order to test the hypothesis that the top-to-North deformation in the North Himalayan Gneiss Domes (NHGD) has been correlated with deformation along the South Tibetan detachment system (STDS). Structural analysis suggests that the X-axes of sheath folds at the different flanks of the dome are consistent, and show average a trend and plunge of 350 degrees and 18 degrees. Many shear sense indicators are recorded in the ductile shear zone during the top-to-north deformation, including the augen structure, sigma-type and delta-type rotating porphyroclast, S-C fabric and pressure shadow structure. The development of the sheath folds first provide a direct-field structural evidence that represents a deeper ductile manifestation of the STDS, and further suggests that the top-to-north deformation in the NHGD have been correlated with deformation along the STDS. The emplacement of the synkinematic granites at ca. 32 Ma exposed at the core of the sheath folds is also interpreted as the initiation of slip along the STDS.
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